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(1) Contents Trouble type Main unit board failure
Trouble code C4801 Rank C
Detection timing MFP detects simultaneous replacement of multiple boards.
Trouble isolation -
Relevant electrical parts • SSD board (SSDB)
• Printer control board (PRCB)
Step Action Control signal Location of electrical components
1 Reinstall the old PRCB. - -
2 If the above actions do not solve the problem, contact
KM. - -
• Do not replace the printer control board and the SSD board at the same time. The backup data is lost and image failure may be
Toner level sensor /C malfunction
• An error occurs on the toner level sensor board (TLSB).
1 Check the cable and connector for proper connection and correct as necessary. 2 Change TLSB. 3 Change PRCB.
0500H Heating roller warm-up failure:
The thermistor /1 does not detect the specified temperature and the warm-up cycle is not completed even after the lapse of a given period of time after the cycle has been started.
Relevant electrical parts
Printer control board (PRCB)
DC power supply (DCPU)
1 Check the fuser unit for correct installation (whether it is secured in position).
2 Check the connector between fuser unit - PRCB PJ9 for proper connection and correct as necessary.
3 Check the connector between fuser unit - DCPU CN2 for proper connection and correct as necessary.
4 Change fuser unit.
5 Change PRCB.
6 Change DCPU.
The blowout of a fuse for the
transfer/separation suction fan
(FM4) in the printer control board
(PRCB) is checked.
An abnormal condition occurs
with the FM4 EM signal a specified
period of time after FM4 is turned
ON. This abnormal condition
recurs even a specified period of
time after FM4 is turned OFF and
then turned ON, and an error
detection signal (blowout of a
fuse) is detected with the 24V normal
Your Fan (FM-4)or the Board PRCB (Printer Control Board) is bad. Hope the fan not the board $$$$$$$$$$$$$$